I'm not sure that Linda, as a Family Member of WikiTree, has sufficient privileges to do that. It might be necessary to become a full Genealogist member by signing the Honor Code.
In any event, Linda can send an introductory message to the relative who created the profiles (he's an active member) by using the "send a private message" link on his profile. And now that she has created duplicate profiles for her parents, members have proposed a merge for her father's two profiles and I'll see if there are other duplicates needing to be merged. (Please don't create any more duplicates -- communicate with the other member instead.)